v2 -> v3: - Attend Greg's and Can's comments - rebase on Daejun's v21 v1 -> v2: - attend Greg's and Daejun's comments - add patch 9 making host mode parameters configurable - rebase on Daejun's v19 The HPB spec defines 2 control modes - device control mode and host control mode. In oppose to device control mode, in which the host obey to whatever recommendation received from the device - In host control mode, the host uses its own algorithms to decide which regions should be activated or inactivated. We kept the host managed heuristic simple and concise. Aside from adding a by-spec functionality, host control mode entails some further potential benefits: makes the hpb logic transparent and readable, while allow tuning / scaling its various parameters, and utilize system-wide info to optimize HPB potential. This series is based on Samsung's V19 device-control HPB2.0 driver, see msg-id: 20210218090853epcms2p8ccac0b5611dec22afd04ecc06e74498e@epcms2p8 in lore.kernel.org. The patches are also available in wdc ufs repo: https://github.com/westerndigitalcorporation/WDC-UFS-REPO/tree/hpb-v21 This version was tested on Galaxy S20, and Xiaomi Mi10 pro. Your meticulous review and testing is mostly welcome and appreciated. Thanks, Avri Avri Altman (9): scsi: ufshpb: Cache HPB Control mode on init scsi: ufshpb: Add host control mode support to rsp_upiu scsi: ufshpb: Add region's reads counter scsi: ufshpb: Make eviction depends on region's reads scsi: ufshpb: Region inactivation in host mode scsi: ufshpb: Add hpb dev reset response scsi: ufshpb: Add "Cold" regions timer scsi: ufshpb: Add support for host control mode scsi: ufshpb: Make host mode parameters configurable Documentation/ABI/testing/sysfs-driver-ufs | 68 +++ drivers/scsi/ufs/ufshcd.h | 2 + drivers/scsi/ufs/ufshpb.c | 622 +++++++++++++++++++-- drivers/scsi/ufs/ufshpb.h | 44 +- 4 files changed, 691 insertions(+), 45 deletions(-) -- 2.25.1
